Looks like you've got it covered. I would try re-seating the memory (taking it out and putting it back in) and pay close attention to how it goes in. ALSO, with one hand, be sure to touch the bare metal frame of the PC the entire time you touch any circuit card assembly (to include your memory sticks) to reduce the chances of static electrity damage to the chips themselves. If that doesn't work, try using the onboard video, and removing the geforce to see if that might have caused a problem (I doubt it, but dumber things have happened). After that, its going to take someone with more G-2 than I have.